Soft magnetic powder core

Abstract

The present invention provides a soft magnetic powder core with a high electrical resistivity and a high strength. The soft magnetic powder core of the present invention is characterized in that in the soft magnetic powder core containing soft magnetic metal particles with Fe as the main component, the powder core has the structure in which oxide portions are present among soft magnetic metal particles, and the oxide portions are composed of oxides containing V, B and Fe. Further, the amount of B contained in the oxide portions of the powder core is 0.5 or more times and 5.0 or less times of the amount of V in terms of mass ratio.

What is claimed is: 
     
       1. A soft magnetic powder core comprising soft magnetic metal particles with Fe as the main component,
 wherein, said powder core comprises oxide portions containing V, B and Fe among said soft magnetic metal particles, 
 the amount of B is 0.5 or more times and 5.0 or less times of the amount of V in terms of mass ratio, and 
 the total amount of V and B contained in said oxide portions of said powder core is 0.1 mass % or more and 1.0 mass % or less, based on the mass of the oxide portions. 
 
     
     
       2. The soft magnetic powder core according to  claim 1 , wherein, said oxide portions further comprise P and at least one element selected from the group consisting of Na, Zn, Ba, Si and Zr. 
     
     
       3. The soft magnetic powder core according to  claim 2 , wherein, said oxide portions have a multilayered structure with three layers or more in the interior. 
     
     
       4. The soft magnetic powder core according to  claim 3 , wherein, said soft magnetic powder core comprises glass portions inside the magnetic core. 
     
     
       5. The soft magnetic powder core according to  claim 2 , wherein, said soft magnetic powder core comprises glass portions inside the magnetic core. 
     
     
       6. The soft magnetic powder core according to  claim 1 , wherein, said oxide portions have a multilayered structure with three layers or more in the interior of said soft magnetic powder core. 
     
     
       7. The soft magnetic powder core according to  claim 6 , wherein, said soft magnetic powder core comprises glass portions inside the magnetic core. 
     
     
       8. The soft magnetic powder core according to  claim 1 , wherein, said soft magnetic powder core comprises glass portions inside the magnetic core. 
     
     
       9. The soft magnetic powder core according to  claim 1 , wherein said powder core has a minimum bending strength of 190 MPa and a minimum electric resistivity of 2000 μΩ·m. 
     
     
       10. The soft magnetic powder core according to  claim 1 , wherein the amount of B is 1.5 or more times and 5.0 or less times of the amount of V in terms of mass ratio.